JP2021500281A - Paper processing plant - Google Patents

Abstract

A rewinder (1) adapted to manufacture paper logs and having an inlet (10) for supplying a paper web (W), a take-up station (13) on which the logs are formed, and a completed log. Paper processing equipment (100) including an outlet station (14) for taking out. The rewinder (1) has a wall (P) defining a chamber (C) in which logs are formed and a suction channel (A) below the chamber (C). The suction channel provides suction that causes the formation of a top-to-bottom air flow within the chamber (C). The chamber (C) includes two half chambers (C1, C2) communicating with the air suction channel, resulting in a downwardly directed vertical air flow (VS, VD) in each of them, which in the chamber , A means for adjusting the vertical air flow is provided to supply the same vertically directed air flow rate into the half chamber. [Selection diagram] Fig. 2

Description

The present invention relates to a paper processing plant. In particular, the equipment according to the invention includes a rewinder specifically designed to reduce defects associated with the formation of dust, scrap, and other processing residues.

For example, the manufacture of logs made of paper from which rolls of toilet paper or rolls of kitchen paper are obtained is a lateral reserve of a paper web to form a preliminary cutting line that divides the paper into separable sheets. It is known that various operations, including cutting, are performed along a predetermined path prior to proceeding to log formation, including feeding a paper web formed by one or more stacked plies. ing.

Manufacture of paper logs usually involves the use of a paper tube, commonly referred to as a "core," on which the paper is placed on a core that is gradually introduced into a log-making device, commonly referred to as a "rewinder." A predetermined amount of adhesive is distributed to bond the webs. Due to the concave shape, the adhesive is distributed over the core as it passes along a path that includes an end portion commonly known as a "cradle".

Also, the manufacture of logs involves the use of take-up rollers, which rotate each core around its longitudinal axis, thereby determining the take-up of the web on the core. To do. This process ends when a predetermined number of sheets are wound around the core and the flap of the last sheet is glued to the roll located below the roll thus formed (so-called "flap bonding"). "work).

When the number of sheets wrapped around the core reaches a certain number, the last sheet of the completed log is separated from the first sheet of the next log, for example by a jet of compressed air directed at the corresponding pre-cutting line. Will be done. At this point, the log is removed from the rewinder.

Patent Document 1 discloses the operation of the rewinding machine according to the above procedure. The logs produced in this way are then transported to a buffer storage unit. The buffer storage unit feeds the logs to one or more cutting machines in which the logs are laterally cut to obtain rolls of the desired length.

The operations described above determine the formation of paper or cardboard dust, trimming and scrap. In practice, process residues are formed and the process residues can impair the proper functioning of the machine and need to be eliminated. In addition, some types of paper carry a non-negligible amount of dust, even if it has not been subjected to other processing steps before being wound up by the rewinder.

EP1700805

Its main purpose is to enable efficient processing of residues produced by the processing of paper webs in paper processing plants.

One of the advantages of the present invention is the elimination, or at least a dramatic reduction, of the aforementioned processing residues in the machine of the paper processing plant, and another advantage is the possibility of machine failure and / or shutdown caused by the residue. The reduced sex improves the efficiency of the system, another advantage is related to the improved operating conditions of the motor, which can be favorably placed outside the area affected by the formation and accumulation of residues. This determines the longer life and more efficient sizing of the motor, with the added benefit of improved working conditions for the operator by eliminating, or at least significantly reducing, the dust present in the working environment near the machine. In relation to, another advantage can be identified in the qualitative improvement of the product produced by the plant by reducing the possibility of mixing the product from the machine with any residue, another advantage from the machine The reduced possibility of mixing the resulting product with any residue can be seen in the qualitative improvement of the product produced by the plant, another advantage even by relatively small changes to existing machines or systems. Regarding the structural simplicity of this solution, which provides innovative features.

These advantages and additional advantages of the present invention will be more apparent from the following description and accompanying drawings given as examples, but should not be construed in a limited sense.

It is a schematic side view which removed a part of the embodiment of the rewinding machine of a plant by this invention. It is a simplified view of the machine of FIG. 1 in order to better emphasize the suction chamber manufactured according to the present invention. Another simplified view of the machine of FIG. 1 to better emphasize the suction chamber manufactured according to the present invention. It is a figure which shows the connection part provided in the plant by this invention, and shows roughly the industrial warehouse which has the space which accommodates the machine of a plant inside, and the arrow of this drawing is processing a paper web. Shows the airflow used to determine the movement and / or collection of residues produced by. A diagram of the connections between several parts of the rewinder that form part of the plant. It is a partial schematic side view of the lower embodiment of the machine manufactured according to this invention. It is a schematic top view of the detailed part of the embodiment shown in FIGS. 1 to 3.

In the illustrated examples described below, the rewinding machine (1) installed in the paper processing plant (100) is referred to. In general, the plant (100) is derived from additional machines such as one or more unwinding machines and an embosser installed upstream of the unwinding machine, and a cutting machine installed downstream of the unwinding machine, in addition to the rewinding machine. It is configured and the functions and structures of these machines are known.

Since the configuration and overall operation of the rewinder are known, they will be briefly described. The rewinder (1) has an inlet (10) for supplying a paper web (W) composed of one or more stacked plies. For example, the web (W) arrives from an embosser located upstream of the rewinder (1).

A preliminary cutting device (11) is provided along the path followed by the paper web inside the machine (1), and the preliminary cutting device (11) performs discontinuous cross-cutting of the web (W). This forms a preliminary cutting line that defines the separable paper sheet, facilitating the use of the finished product. In the drawings, reference numeral (15) indicates a web guide roller that defines the path followed by the paper web (W) inside the rewinder (1) by a known method.

The rewinder (1) has a separate inlet (12) for the paper tubular core (2), and on the surface of the core, a predetermined amount of adhesive is applied by a known method, and thus a method not described. Allows adhesion of paper webs on the core that is applied and gradually introduced into the rewinder.

Reference numbers (16) and (17) indicate units for adhering and inserting the core to the machine (1), and reference numbers (122) and (120) respectively insert the core (2). Conveyor belts (122) and guides (120) used for the purpose of supporting the core (2) while the core (2) moves inside the rewinder (1) are shown.

The formation of the log is done at the take-up station (13) by using take-up rollers (13a, 13b, 13c), which rotate each core around its vertical axis and the paper on the core. Decide to wind up. When a predetermined number of sheets are wound around the core, the above process ends. The next operation consists of adhering the flap of the last sheet to the roll located below the roll thus formed (so-called "flap bonding" operation).

When the number of sheets wrapped around the core reaches a certain number, the last sheet of the completed log is separated from the first sheet of the next log, for example by a jet of compressed air directed at the corresponding pre-cutting line. Will be done. At this point, the log (3) is removed from the rewinder through a discharge station where the completed log is discharged through an outlet (14) provided with a discharge surface (140).

According to the present invention, the rewinding machine (1) is provided with a plurality of walls (P) surrounding the equipment forming a part of the rewinding machine (1) and the suction chamber in the following description of the present specification. It forms a storage chamber (C), also called.

The chamber (C) is shown by dashed lines in FIGS. 1, 3 and 4 for better identification. As shown in the illustrated example, the equipment and devices of this rewinder include a guide roller (15), a preliminary cutting device (11) and a take-up roller (13a, 13b, 13c).

In practice, the rewinder (1) is made as a conventional rewinder, but the normally open or breathable area is closed by a wall (P) for log production and removal of the completed log. Determines the configuration of the suction chamber (C), which is not literally "under reduced pressure" due to the presence of openings (10, 12, 14) for the input of the materials used, but nevertheless. , It makes it possible to optimize the suction action, as further described below.

In other words, proper control of the airflow prevents uncontrolled dispersal of the residue associated with the movement and processing of the paper web (W), the residue being retained in the chamber (C) and advantageously. Is eliminated through the inhalation channel (A) described below. The latter determines the generation of airflow from the top to the bottom in the chamber (C).

FIGS. 1, 2 and 3 show the contours shown by the wall (P), each having a given uniform slope at the lower base of the rewinder (1). It is tilted towards the bottom of the suction chamber to form a directed tilted surface. In practice, the individual walls (P) each have a uniform slope so that they do not retain downward residues. The walls (P) are inclined in substantially close to each other so as to form a narrow groove at the bottom of the suction chamber where the suction channel (A) is provided.

In FIG. 3, the reduction in the width of the chamber (C) is represented by the dimensions (D1), (D2) and (D3), which decrease from top to bottom. The dimensions (D1, D2, D3) relate to the loading direction (DM) of the material used to make the log.

These decreasing dimensions of the top-to-bottom chamber (C) determine the corresponding increase in the velocity of the downward airflow. This means that the downward air velocity is low in the upper part of the chamber (C) where the web (W) is present, while the downward air is only interacting with the residue to be removed in the chamber (C). It is advantageous because it is higher in the lower region of. Between the two zones, the maximum and minimum velocity of the downward airflow, there is an intermediate velocity zone where the air interacts with the logs being formed, which is less likely to cause damage than the web (W). To do.

At the bottom of the suction chamber (C) is a suction channel (A) that extends laterally along substantially the entire bottom of the rewinder (1). Actually, the lower base of the rewinding machine (1) is provided with a suction channel (A) connected to the suction means (MA), and the suction means (MA) is shown by a schematic block in FIG. It can be configured by suitable air actuating means such as, for example, a fan, aspirator and the like. The lower arrow (V1) of the chamber (C) schematically represents the direction of airflow caused by the suction channel.

In other words, the suction port (BA) of the channel (A) extends along the entire width of the machine (1), and this suction port (BA) exerts its action downward and is contained in the air and the air therein. It sucks in the residue, and its suction port is open upwards. In reality, the suction port (BA) of the suction channel (A) is an opening of the suction channel (A) communicating with the suction chamber (C), and the opening extends along the upper part of the channel (A). ..

The fact that the suction channel (A) is provided at the lower base of the rewinder (1), i.e. below the suction chamber (C), improves suction. This is because the action of gravity on the residue to be removed is also added to the action of downward suction. The extension of the suction channel (A) according to the width of the rewinder further contributes to the optimization of the suction action.

The suction channel (A) can be connected to an air filtration device (F) to filter the air sucked from the chamber (C).

In FIG. 5, the suction channel (A) is connected to the air filtration device (F) via a duct (19). The air sucked by the chamber (C) is then filtered before being released into the environment surrounding the rewinder (1) or, as shown, before being partially returned to the chamber (C). It is filtered.

Advantageously, the filter (F) is connected via a duct (20) to an inlet (18) located in the upper region of the chamber (C). In this way, a portion of the air drawn from the bottom by the channel (A) and filtered by the filter (F) is introduced into the suction chamber (C) through the inlet (18). Therefore, a combined action of the flow coming from the top and moving downward (V2) and the flow carrying the residue downward (V1) is obtained.

FIG. 6 shows another possible embodiment of the invention with respect to the suction channel (A). FIG. 6 schematically shows the lower part of the suction chamber (C), which in this example has a lower connecting channel (29), the lower connecting channel (29) channeling the suction chamber (C). It is connected to (A) and the channel (A) is arranged laterally with respect to the exit direction of the residue from the suction chamber (C).

For example, the connecting channel (29) has a curved shape and is about 90 ° between its proximal portion connected to the chamber (C) and its distal portion connected to the suction channel (A). There is an angle. The lower part of the channel (29) communicates with the lower container (33) with an open upper part.

An opening (not shown) can be provided in the channel (29) to facilitate the introduction of the external airflow (V3) towards the suction channel (A). The size of the above-mentioned opening can be adjusted by the gate valve schematically indicated by the reference numeral “32” in FIG. In practice, referring to the example shown in FIG. 6, the residue discharge channel (29) is "L" having a longer arm connected to the chamber (C) and a shorter arm ending in the channel (A). Forming the shape, the flow (V3) can favor the entry of smaller mass and dimension residues in the channel (A), allowing residues with higher mass or dimensions to continue to flow downwards. to enable.

With reference to the configuration shown in FIG. 6, the residues (30), (31) are pushed down and / or aspirated to reach the channel (29) according to the flow shown in (V1). Once inside the channel (29), the heaviest residue represented by (31) in the illustrated example is directed downwards into the vessel (33). Because for heavy residues gravity (and the possible contribution of thrust V1) is common with respect to flow (V3), while lighter and / or smaller residues (30) are suction channels. This is because it is directed to (A). The heaviest residue (31) is, for example, perhaps a larger residue of paper material or a piece of adhesive. The lightest / smallest residue (30) can be paper dust, powder of other materials, and the like.

In other words, according to the present invention, a means for separating the residue can be provided, and in the example of FIG. 6, the means are a channel (29), a container (33), and optionally a channel (29). Includes an opening formed above.

In the configuration of FIG. 6, the channel (A) is laterally offset with respect to the suction chamber (C) so that the suction port (BA) is lateral. In this configuration, the plant can be provided with means to send an additional air stream (V3) towards the suction port (BA) of the channel (A), as described above. This additional air flow (V3) does not pass through the suction chamber (C). The use of the additional air flow (V3) is advantageous when the distance between the suction port (BA) of the channel (A) and the residue discharge channel (29) is greater than a predetermined value, eg, a value greater than 10 mm. Is considered to be.

The walls of the chamber (C) can be provided with removable or openable doors (27) with relative actuating means (28) schematically shown in FIG. The door (27) can be configured by, for example, a hinged door or a sliding door, and the relative actuating means (28) can be equipped with, for example, a handwheel, rack, or other suitable device. The presence of the door allows access to the inside of the machine when, for example, maintenance work, cleaning work, elimination of material clogging, and similar work need to be performed.

As better shown in FIG. 4, the electric motor (M) that operates the take-up roller provided at the log take-up station (13), as well as the other motors of the rewinder (1), are driven by process residues. It can be placed outside the suction chamber (C) in an unaffected area. In this way, the motor (M) is in a cleaner zone and is unaffected by paper processing residues. On the contrary, in conventional systems, the size of the motor must be determined considering that it may be difficult to maintain the correct operating temperature due to the presence of residues covering the motor and associated cooling fins or fans. It doesn't become.

FIG. 4 shows a possible embodiment of the plant (100) according to the present invention. The system (100) is located inside a cabin (110) with an outer wall (PE), which separates the cabin and separates it from the rest of the industrial building (111) that houses the plant. .. In this way, a containment chamber for the entire paper processing plant (100) is formed. The paper processing plant (100) is composed of a plurality of machines (1, 101, 102).

In FIG. 4, the machine (1) is a rewinder, and the other machines (101) and (102) are represented by schematic blocks. The machines (101) and (102) may be, for example, an embosser, a printing unit, an unwinding unit, or the like. More generally, a machine installed in a plant is the physics of a web paper material (W) consisting of one or more unwinding, rolling, embossing, collating, printing, or cutting operations. A machine configured to perform target transformations.

Embossing can be combined with paper material sizing in a single unit. Printing can be performed by a printing unit arranged upstream of the embossing machine, which is a machine for embossing the material (W). The logs can be cut using a cutting machine that cuts the logs produced by the rewinder.

Inside the cabin (110), the rewinder (1) is defined by a wall (P) to form a suction chamber (C) as described above, which is simplified for other machines (101, 102). Therefore, a similar containment chamber (not shown) can be provided. In practice, one or more paper machines forming the plant (100) are opened only corresponding to the substantially closed chambers (ie, the openings used for the inlet and outlet of the material to be processed). In order to carry the residue to a particular point or region in which the residue can be advantageously collected and / or removed, a suction action is generated against the external environment.

Residue containment and recovery can be increased and optimized by the specific arrangement of airflow, which is outlined by the arrows in the figure. The arrow (F1) indicates the airflow in the direction of building (111) -machine (1), the arrow (F2) indicates the airflow in the direction of cabin (110) -machine (1), while the arrow (F3). Indicates the airflow in the building (111) -cabin (110) direction. In practice, the walls defining the suction means and the suction chamber can move the residue along the desired direction, or direct them to the collection and / or withdrawal point as channel suction (A) described above. Determine the pressure difference that can be made. Also, in the structure of the cabin (110) and the structure of the space accommodating the machines (101, 102), the wall (P) can be arranged to keep the motor (M) outside the respective suction chambers. ..

Machines (101, 102) can be housed together with machine (1) in a single cabin (110), as in the example of FIG. 4, or each machine forming a plant can be provided with a cabin. it can.

Another aspect of the invention relates to the favorable distribution of the flow that determines the downward movement of the residue, in particular the balanced flow of the flow into the two zones defined by the web (W) within the storage chamber (C). Regarding division.

In FIG. 1, the paper material web (W) to be processed divides the entire chamber (C) into two half chambers (C1) and (C2), so they are located on the left side of FIG. It is placed on the right side of 2. Correspondingly, due to the fact that the suction channel (A) communicates with both the half chambers (C1) and (C2), the vertical flow of air directed downwards is shown in FIG. As such, it can be divided into a first or left airflow (VS) and a second or right airflow.

The flows (VS) and (VD) pass on the left and right sides of the drawing with respect to the station for forming the log (3), respectively. Upstream of the station (13) with respect to the direction of arrival of the web (W) (WP), the first airflow (VS) passes through the inlet region (12) of the core (2) and correspondingly the second. Flow (VD) passes through the retrieval area (14) of the log (3) located downstream of the station (13).

As described above, the components of the rewinding machine (1) arranged in the region can be sized and shaped so as not to distinguish between the downward flow (VS) and the (VD). One of those possible embodiments is shown in schematic plan view in FIG.

In FIG. 7, the block (13) represents a station for forming a log (3) that divides the upstream zone (inlet zone 12) from the downstream zone (exit area 14). The upstream zone at the top of FIG. 7 corresponds to the bottom of the chamber (C1), which is defined at the top by the wall (P) and at the bottom by the station (13) in the figure. The downstream zone located at the bottom of FIG. 7 corresponds to the bottom of the chamber (C2), which chamber (C2) is defined at the top by the station (13) and at the bottom by the wall (P).

In the area upstream of the take-up station (13) (upper part of FIG. 7), the lower part of the chamber (C1) intersects a plurality of guides (120), which are located above the belt (122). Because it can be seen in plan view. The guide (120) and belt (122) are separated from each other in a manner known per se to support the core (2) directed at the take-up station (13), and a free space (121) is formed. .. The flow (VS) in the downward path passes through the space (121) of the inlet portion (12) of the core upstream of the log forming station (13).

In the area downstream of the station (13) (bottom of FIG. 7), the lower part of the chamber (C2) is defined downward by a chute (140) used to retrieve the log (3). Advantageously, the chute (140) is provided with a plurality of holes (141) for the passage of airflow (VD), and the entire surface of the holes (141) is the free space (121) of the inlet portion (12). Substantially corresponds to the total area. In this way, the passage of the two streams (VS) and (VD) flowing through the inlet portion of the core and the discharge section of the log in the chamber (C), respectively, is blocked to substantially the same extent, and thus the two streams. There is no horizontal perceptible velocity gradient between (VS) and (VD).

In other words, the plant object of the present invention comprises means for controlling the vertical air flow (VS, VD) in the half chamber (C1) and (C2), which control means is the half chamber (C1). And (C2) can determine the flow of equal fluids, and thus the interaction of the same fluid on the two sides of the tape (W). Advantageously, the horizontal zero gradient allows for optimal residue aspiration without adversely affecting the processing of the processed web.

Means for controlling the airflow in the half chambers (C1) and (C2) are that they determine the vertical flow (VS, VD) of air in the same fluid in the half chambers (C1) and (C2). It can also be made different from the one disclosed above, provided that it can be made.

According to the present invention, the control of the vertical air flow (VS, VD) is provided at the inlet portion of the core upstream of the log forming station (13) and at the portion where the log is taken out downstream of the same forming station (13). It is achievable through the openings (121, 141), which are the same vertical flow of air upstream and downstream of the station (13) in the half chambers (C1, C2) (121, 141). It is sized to determine VS, VD) so that the pressure exerted by the air on the two sides of the web (W) in the chamber (C) is substantially the same. As mentioned above, the total area of the holes (141) substantially corresponds to the total area of the openings (121) in the suction chamber (C).

The present invention is not limited to the disclosed and illustrated embodiments, and can be modified within the appended claims.

Claims (14)

Completed with a winder (1) adapted to manufacture paper logs and having an inlet (10) for supplying a paper web (W), and a winder station (13) on which the paper logs are formed. A paper processing plant (100) for processing paper webs, including an exit station (14) for retrieving logs.
The winder (1) is provided with a plurality of walls (P) defining a chamber (C) in which a paper log is formed.
The winder (1) comprises an air suction channel (A) located and acts below the chamber (C), which is an air flow from top to bottom inside the chamber (C). Adapted to make suction that causes formation,
Then, both of the chambers (C) are subdivided into two half chambers (C1 and C2) communicating with the air suction channel (A), and a downward vertical air flow (VS, VD) is generated in each half chamber. The chamber is provided with adjusting means for adjusting the vertical airflow (VS, VD) to provide the same vertically directed air flow rate into the half chambers (C1) and (C2). A paper processing plant featuring. The plant according to claim 1, wherein the air suction channel (A) has an opening (BA) extending over the entire width (L) of the rewinder (1). The plant according to claim 1, wherein the rewinding machine (1) includes an electric motor (M) arranged outside the chamber (C). The plant according to claim 1, wherein the wall (P) is inclined so that the storage chamber (C) is narrowed at the bottom corresponding to the air suction channel (A). The plant according to claim 1, wherein the air suction channel (A) is connected to an air filtration device (F) downstream. The air channel (A) is connected downstream to an air filter (F) and then to an inlet (18) located at the top of the chamber (C) for filtration into the chamber (C). The plant according to claim 1, wherein the air is introduced. The plant according to claim 1, further comprising a storage cabin (110) adapted to delimit the environment surrounding the plant from the rest of the building (111) in which the plant is located. The plant according to claim 7, wherein the chamber (C) is inside the storage cabin (110). The equipment according to claim 8, wherein the motor of the rewinding machine (1) is located outside the storage cabin (110). The plant according to claim 1, wherein the wall of the storage chamber (C) is provided with a removable or openable door (27) provided with each operating means (28). A claim characterized in that a residue separation means (29, 33) is provided for separating the residue (30, 31) carried by the air stream by the mass and / or size of the residue itself. Item 5. The plant according to any one of Items 1 to 10. The residue separating means includes a connection channel (29) that connects the chamber (C) to the air suction channel (A), a container (33) located at the bottom of the connection channel (29), and the residue. Including an air blowing means (32) adapted to carry a portion (30) of the air towards the suction channel (A).
The air suction channel (A) is arranged laterally with respect to the outlet portion of the residue from the storage chamber (C).
11. The plant of claim 11, wherein the connecting channel (29) has a lower portion that communicates with a container (33). The chamber (C) is divided into two half chambers (C1) and (C2) by a paper web (W) to be processed, and an equal amount of air flow in the two half chambers (C1) and (C2). The plant according to claim 1, wherein (VS, VD) determines the same amount of pressure on the two sides of the paper web (W). The opening (121) in which the means for adjusting the air flow has the same area and is arranged in each of the half chambers (C1, C2) in the region where the air flows (VS, VD) intersect. , 141) The plant according to claim 1.

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